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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(5 10)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> QPDS Services Client Project ID Tosco#5886, 2701 W March Ln , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 7050197-210 Reported May 14, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD <br /> Batch# 7050207 7050207 7050207 7050207 <br /> Date Prepared 5/7/97 5/7/97 5/7/97 5/7/97 <br /> Date Analyzed 5/7/97 5/7/97 5/7/97 5/7/97 <br /> Instrument I D # HP 2 HP 2 HP-2 HP-2 <br /> Conc Spiked 20 ug/L 20 ug/L 20 ug/L 60 ug/L <br /> Matrix Spike <br /> % Recovery 85 105 95 90 <br /> . Matrix Spike <br /> Duplicate% <br /> Recovery 95 115 105 98 <br /> Relative % <br /> Difference 11 91 10 89 <br /> LCS Batch# 2LCS050797 2LCS050797 2LCS050797 2LCS050797 <br /> Date Prepared 5/7/97 5/7/97 5/7/97 5/7/97 <br /> Date Analyzed 5/7/97 5/7/97 5/7/97 5/7/97 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 90 110 100 90 <br /> % Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 <br /> Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> �gnature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B Kemp Interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 7050197 MPD <10> <br />